exists and is an alternate of . Since this is regarding statistics I assume you mean lower case sigma (Ï) which, in statistics, is the symbol used for standard deviation, and Ï2 is known as the variance.
The Acceptable Quality Limit, commonly referred to as AQL, is a method widely used to measure a production order sample to find whether or not the entire product order has met the client's specifications. The customer then has the data to make an informed decision to accept or reject the lot.
Sampling in Qualitative Research Even if it were possible, it is not necessary to collect data from everyone in a community inorder to get valid findings. In qualitative research, only a sample (that is, a subset) of a popula-tion is selected for any given study. The studyâs research objectives and the characteristics of thestudy population (such as size and diversity) determine which and how many people to select. Inthis section, we briefly describe three of the most common sampling methods used in qualitativeresearch: purposive sampling, quota sampling, and snowball sampling.